bflag is a simple Go package for building command-line interfaces. It primarily does two things:
- Allows you to define valid command-line options for your program.
- Parses user-provided options and gives you all the other arguments (minus the options) so your program can react accordingly.
There is already a similar official package called flag that has many more features than bflag, but it ultimately didn't fit my needs because it only supports single-hyphen (-flag) options.
package main
import (
"fmt"
"github.com/jonbeebe/bflag"
)
func main() {
// Define options for our program
boolOpt := bflag.DefineBool("mybool", 'b', false)
strOpt := bflag.DefineString("mystr", 's', "Hello world")
intOpt := bflag.DefineInt("myint", 'i', 32)
floatOpt := bflag.DefineFloat("myfloat", 'f', 16.5)
bflag.Parse()
// Output invalid arguments (if any were provided)
args := bflag.Args()
command := args[0]
for _, v := range bflag.Invalid() {
fmt.Println("bflagtest " + command + ": " + v)
}
// Print options
fmt.Printf("Options (%d): ", bflag.NOptions())
fmt.Printf("--mybool: %t --mystr: %s --myint: %d --myfloat: %.2f\n", boolOpt.Value, strOpt.Value, intOpt.Value, floatOpt.Value)
// Print arguments (bflag doesn't differentiate between commands and arguments)
fmt.Printf("Arguments (%d): ", bflag.NArgs())
for _, v := range args {
fmt.Printf("%s ", v)
}
fmt.Print("\n")
}
- Handling of
--helpand--versionoptions - Documentation